Process of building reinforced-concrete arches.



I). B. LUTBN. PROCESS OF BUILDING REINFORCED CONCRETE ARUHES.

APPLICATION FILED JULY 27, 1311 1,089,488 Patented Mar. 10, 1914.

VWI'IWESAFS; d a 750 IN VEl OR. @ZJAM JMQZZ UNITED STATES PATENT OFFICE.

DANIEL B. LUTEN 0F INDIANAPOLIS, INDIANA.

PROCESs OF BUILDING REINFORCED-CONCRETE ARCHES.

Original application filed May 17, 1902, Serial No. 107,812. Divided 1911. Serial No. 640,834.

To all whom it may concern Be it known that I, Diin'mn B. Lu'rnnfa citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana. have invented a new and useful Process of l luilding Reinforced-Concrete Arches, of which the following is a specification.

My invention relates to a process of build iug reinforced concrete arches and has for its purpose to provide a method of placing the reinforcing members for arch structures, resulting in greater use of erection, accuracy of placing anfisceurity of anchorage.

The present. application constitutes a division of an application filed by me May 1?. i902, Serial No. 107.812. I

The invention is illustrated in the accompanying drawings in which the same reference cha actcrs describe like parts throughout the several views. 7

Figure 1 is a longitudinal section of an arch, the two halves being on different section lines, Fig. 2 is a sectional half plan of the footings of the arch. Fig. 3 is a detail section of the connection between members, and Fig. at is a phantom perspective of one cud of an arch. showing the embedded tension members, the centering, and the (litterent stages in the process of building.

The process consists in erecting a rein 'l'orccd concrete arch by first laying foundations (it), then placing a concrete pavement 61 with longitudinal reinforcing members ()2 embedded therein and projecting beyond the ends of the pavement and lying above the foundations. The ends of these reinforcing members are formed into spirals 66 for anchorage as shown in Figs. 2, 3, and l. the spirals being tangential to the members and of decrea ing radii from the point of tangenov. Such a spiral serves to anchor the member securely with minimum extension, it being possible to develop the full strength of the member by such a spiral anchor in concrete with less than one half the length required for a straight extension. Sutlicient straight extension cannot usually be secured because of the thinness ofthe abutment. Reinforcing members 63 and 64 to be later embedded in the arch are then anchored to'- Specification of Letters Patent.

Patented Mar. 10, 1914. and this application filed July 27,

the projecting spirals (36 of the pavement spirals do passing through the above menti n spirals (lb. The ends of the vcrt ical reinforcing n'icanbers h and 61-, as seen in Figs. 3 and "l, are bent around thecorresponding horizontal pavement members U2 and the end hooked over one of the adjacent horizontal pavement members. The ends of the members (A may b hooked around the second distantrod, as shown at. St), or around the adjacent rod, as shown at 90. but ot course in either case the principle remains the same and an) arrange ment in this respect is still within the cope of the invention. Figs. 2 and 4- show the ends 91 of the horizontal pavement members (i2 looped about in the same manner, the said ends being hooked about the adjacent ertical members til; or therods ma be extended at an angle into the concrete and anchored, thus bonding in transverse direction. This arrangement ot' the ends has the advantage ct providing a construction in which the ends of the rods cannot pull out and also t'uri'iishes the abutment. with a transverse bonding and strengthening member which tends to prevent unequal settlement. The centers on which the tll'tll i to be formed are erected on the pavement til and the members (33 and (it are tanbcddml in the concrete or other material oi" the ben h walls or abutments and the lllilll H rs il pass close to the intrados of the arch at the crown 76. The members (3i prct'crahlv sag a little so that the least weight upon the arch will produce tension in. them. lVhcn brought to their proper curvature they ma;- be tentporarily attached to the centers at !)t'-::: sional intervals to hold them to place. the anchorage at the end of each uni-tuber serving to secure it with the assistance of occasional attachment or bracing at infrequent intervals. The pavement on which the centers are erected, serves as a solid foundation for supporting the centers for the arch, as Well as increasing the l'itttl'lllfl area of the foundations of the structure.- The pa vemcnt strengthened by the embedded rods. enabling it to better stand the strains to which it is subjected in sustaining ttolccnters tor the arch in the course of its- (lIGCl'ltFIE' Finally the concrete of the arch ring is placed on the centers to completely embed all reinforcing members. After llowing sufficient time to elapse to perinittthe concrete to harden properly the centers are removed.

I claim 1. That improvement in the art of building a reinforced concrete arch comprising placing concrete foundations, then placing tension members having spiral ends projecting into the space over said foundations, then erecting the centers for the arch, then placing arch reinforcing members having spiral ends and interlockim such spiral ends with the spiral ends of the first named tension members, then bending the arch reinforcing members so that they are supported -by the centers, and then placing the concrete of the arch to embed the arch reinforcing members and the projecting spiral ends.

2. That improvement in the art of building a reinforced concrete arch comprising lacin' concrete foundations, then lacin b D tension members having bent ends projecting into the space over said foundations, then erecting the centers for the arch, then placing arch reinforcing members having bent ends, then bending the arch reinforcing members so that they are supported by the centers, and then placing the concrete of the arch to embed the arch reinforcing members and the projectingbent ends.

3. That improvement in the art of building a reinforced concrete bridge comprising placing the foundations, then laying be tween the foundations a pavement having anchor cnds projectii, g into the space over the foundations, then erecting on-thc pavement the centers for the arch. then placing arch reinforcing members and interlocking them with the projecting anchor ends, then bending the arch reinforcing members into position where they are supported at the crown by the centers, and finally embedding the arch reinforcing members and the projecting anchor ends in concrete.

4 That imprm ement in the art of building a rcinfoicml concrete bridge comprising placing the foundations, then laying between the foundations a pavement having anc ior ends projecting from the pavement into the space over the foundations, then erecting on the pavement the centers for the arch, then placing arch reinforcing members and interlocking them with the projecting anchor ends. and finally embedding the arch reinforcing members and the projecting anchor ends in concrete.

5. That improvement in the art of building a reinforced concrete bridge comprising placing the foundations, then laying befrom the pavement l tween the foundations a pavement having i anchor ends projecting from the pavement into the space over the foundations, then erecting on the pavement the center for the arch, then placing arch reinforcing memibers, then bending the arch reinforcing l members into position where they are supported at l finally embedding the arch members and the prbjecting anchor QIldS lIl concrete.

6. That improvement in the art of building a reinforced concrete bridge comprising placing the foundations, then laying be tween the foundations a pavement having anchor ends projectingfrom the pavement into the space over the foundations, then erecting on the pavement the centers for the arch, then placing arch reinforcing members, and finally embedding the arch reinforcing members and the projecting anchor ends in concrete.

7. That improvement-in the art of build ing a reinforced concrete bridge comprising placing the foundations, then laying between the foundations a pavement having anchor ends projecting from the pavement into the space over the foundations, then erecting on the pavement the centers for the arch, then placing arch reinforcing members and supporting them on the centers, and finally embedding the arch rcinforcing members and the projecting anchor ends in the concrete.

8. That improvement in the art of building a reinforced concrete arch comprising placing concrete foundations and tension members, the latter having bent ends projecting into the space over said foundations. then erectin the centers for the arch, then placing arc reinforcing members having bent ,ends and interlocking them with the bent ends of the first named tension memi bers, and then placing the concrete'of the arch to embed the arch reinforcing members and the projecting bent ends.

9. That improvement in the art of build ing a reinforced concrete bridge comprising placing the foundations and a pavement between the foundations and embedding in the pavement tension members having anchor ends projecting into the space over the foundations, then erecting on the pavement the centers for the arch, then placing arch reinforcing members and interlocking them with the projecting anchor ends, and finally embedding the archreinforcing members and the projecting anchor ends in concrete.

10. That improvement in the art of building a reinforced concrete bridge comprising placing the foundationsand wpavement between the foundations and embedding in the crown by the centers, and

reinforcing.

the pavement tension members havina 811- ohor ends projecting into the space over the my hand andseal a foundations, then erecting on the pavement the centers for the arch, then placing arch reinforcing members, and finally embedding t Indianapolis, Indiana, this 24th day of J uly, A. I). one thousand ninehundred and eleven.

In witness whereof, I have hereunto set I DANIEL B. LUTEN. {ne the arch reinforcing members and the pro- Witnesses: jecting anchor ends in concrete. 5 MAY LAYDEN,

FRANK A. FAHLE.

Goples of this patent may be obtained for five pants each, by eddressin g the Commissioner e! Patents, Washington, D. (3. i 

